diff --git a/code/qcommon/qcommon.h b/code/qcommon/qcommon.h
index bd490382..137fa43d 100644
--- a/code/qcommon/qcommon.h
+++ b/code/qcommon/qcommon.h
@@ -355,6 +355,8 @@ typedef enum {
 	TRAP_TESTPRINTFLOAT
 } sharedTraps_t;
 
+typedef intptr_t (QDECL *vmMainProc)(int callNum, int arg0, int arg1, int arg2, int arg3, int arg4, int arg5, int arg6, int arg7, int arg8, int arg9, int arg10, int arg11);
+
 void	VM_Init( void );
 vm_t	*VM_Create( const char *module, intptr_t (*systemCalls)(intptr_t *), 
 				   vmInterpret_t interpret );
@@ -1080,7 +1082,7 @@ NON-PORTABLE SYSTEM SERVICES
 void	Sys_Init (void);
 
 // general development dll loading for virtual machine testing
-void	* QDECL Sys_LoadGameDll( const char *name, intptr_t (QDECL **entryPoint)(int, ...),
+void	* QDECL Sys_LoadGameDll( const char *name, vmMainProc *entryPoint,
 				  intptr_t (QDECL *systemcalls)(intptr_t, ...) );
 void	Sys_UnloadDll( void *dllHandle );
 
diff --git a/code/qcommon/vm_local.h b/code/qcommon/vm_local.h
index 07e89675..f649cf81 100644
--- a/code/qcommon/vm_local.h
+++ b/code/qcommon/vm_local.h
@@ -154,7 +154,7 @@ struct vm_s {
 
 	// for dynamic linked modules
 	void		*dllHandle;
-	intptr_t			(QDECL *entryPoint)( int callNum, ... );
+	vmMainProc	entryPoint;
 	void (*destroy)(vm_t* self);
 
 	// for interpreted modules
diff --git a/code/sys/sys_main.c b/code/sys/sys_main.c
index 40b07e5d..ae46c705 100644
--- a/code/sys/sys_main.c
+++ b/code/sys/sys_main.c
@@ -579,7 +579,7 @@ Used to load a development dll instead of a virtual machine
 =================
 */
 void *Sys_LoadGameDll(const char *name,
-	intptr_t (QDECL **entryPoint)(int, ...),
+	vmMainProc *entryPoint,
 	intptr_t (*systemcalls)(intptr_t, ...))
 {
 	void *libHandle;